Community R-Series Installation/Operation Manual for Models R.5 and R.25 — Page 19
However, in most cases, using transformer versions of the R-Series loudspeakers along with 70.7 volt or 100
volt amplification will yield the best performance at a reasonable cost. In this approach, the need for larger
gauge wire will be reduced. Refer to pages 10 and 21 for more discussion of this topic and the technical support
page of our website for technical articles on this subject.
If installed outdoors, the insulation of the installer-provided cabling should be resistant to water, the effects of
temperature, and the effects of ultraviolet radiation from the sun. These are recommended insulations:
polyethylene, neoprene, Teflon™, Silicon™, and Hypalon™. These insulations are not recommended because
of potentially shorter life expectancy in outdoor environments: rubber, PVC (polyvinylchloride), polypropylene,
polyurethane, and nylon.
Recommended High-Pass Filter
Community recommends use of a high-pass filter to prevent over-excursion of the LF driver from lower
frequencies that it is not designed to reproduce. See the Specifications section for the recommended high-pass
filter for each model.
Many power amplifier manufacturers offer plug-in high-pass filter input modules. This is an excellent method to
provide the necessary filter and to make it relatively tamperproof.
IMPORTANT:
Operating an R-Series loudspeaker without the recommended high pass filter will
reduce its low frequency power handling and may result in physical damage to the low-frequency
devices.
INSTALLATION
Run Length
Minimum Gauge
(AWG)
Total Resistance
10 ft. (3m)
16
0.08 ohm
25 ft. (8m)
14
0.13 ohm
50 ft. (15m)
12
0.16 ohm
75 ft. (25m)
10
0.15 ohm
100 ft. (30m)
10
0.20 ohm
200 ft. (60m)
10
0.40 ohm
300 ft. (90m)
10
0.60 ohm
400 ft. (120m)
10
0.80 ohm
500 ft. (150m)
10
1.00 ohm
Figure 1: Recommended Cable Gauge
